1936] MAMMALS OF OREGON 241 



DIPODOMYS HEERMANNI GABRIELSONI GOLDMAN 



GABRIELSON'S KANGAROO RAT 



Dipodomys heermanni galyrielsoni Goldman, Biol. Soc. Wash. Proc. 38: 33-34, 

 1925. 



Type. Collected at Brownsboro, Jackson County, Oreg., by Ira N. Gabriel- 

 son, June 21, 1924. 



General characters. Similar to Dipodomys heermanni californiciis but 

 silghtly darker, and witb broader maxillary arches and smaller mastoid 

 inflations of the skull. Tail long and white-tipped. Upper parts dark buff, 

 heavily overlaid with black over top of head and back; face marked with 

 black; soles of hind feet, and top and bottom of tail blackish; lower parts, 

 sides and tip of tail, stripe across hams, and ear and brow spots, white. 



Measurements. Type, male adult : Total length, 294 mm ; tail, 188 ; foot, 46. 



Distribution and habitat. All of the specimens examined are 

 from the vicinity of Brownsboro, some 15 miles northeast of Med- 

 ford, where they were collected by Gabrielson, Jewett, Moore, and 

 Heckner, but the tracks and trails may be seen in the open chaparral 

 parts of practically all of the Upper Sonoran area of the Rogue 

 River Valley from Grants Pass to Ashland (fig. 53). 



General habits. In a letter of June 25, 1923, Ira N. Gabrielson 

 wrote that these kangaroo rats were found in the Brownsboro 

 country below 4,000 feet altitude where they inhabit the chaparral, 

 making their burrows at the base of the bushes and around old 

 stumps. They were not abundant, and while no specimens were 

 secured in traps, several were picked up where poisoned grain was 

 put out for rodents. In June they were feeding mainly on foxtail 

 grass, which in places forms a solid cover for the ground. The 

 refuse where the seeds had been removed from the grass was often 

 found scattered on the ground where they fed, and its seeds along 

 with some of the poisoned wheat were found in the one nest burrow 

 dugout. 



MICRODIPODOPS MEGACEPHALUS OREGONUS MERBIAM 

 OREGON GNOME MOUSE 



Microdipodops megacephalus oregonus Merriam, Biol. Soc. Wash. Proc. 14 : 127, 

 1901. 



Type. Collected on Wild Horse Creek, 4 miles northwest of Alvord Lake, 

 Oreg., by Clark P. Streator, August 18, 1896. 



General characters. Size of a large mouse ; body short and wide ; head large 

 and wide with large eyes, short rounded ears, and ample fur-lined cheek 

 pouches ; skull with greatly inflated mastoids and audital bullae ; hind feet long 

 with densely hairy soles and five well-developed toes; tail thickest in the mid- 

 dle, tapering to a point, and a little longer than head and body, not crested or 

 tufted; fur long, lax, and silky. Upper parts buffy gray with white ear 

 patches ; sides of nose, edges of ears, and narrow border along sides clear buff ; 

 lower parts white or creamy ; feet gray ; tail dark buff above with dusky tip, 

 light buff below. Immature pelage darker and grayer. 



Measurements. Of type, male adult : Total length, 153 mm ; tail, 88 ; foot, 24 ; 

 ear (dry), 8. Of a larger male, 163; 96; 25; 9. Another male measured 167; 

 97 ; 25 ; 10, and weighed 13.9 g. 



Distribution and habitat. There are specimens of these quaint 

 little animals in the Biological Survey collection from near Alvord 

 Lake, near Tumtum Lake, head of Crooked Creek, White Horse 

 Sink, and the Narrows, all in extremely arid Upper Sonoran Zone 



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